Effects of Bi-row Concave Ridge and Film-mulching on Soil Moisture of Tillage Layer in North Guizhou Tobacco Area

The experiment was carried out both in flat and sloping tobacco fields of north Guizhou Province to study the effects of of bi-row concave ridge and film-mulching on soil moisture at 10 and 20 cm tillage layers. The results showed that the soil moisture content was higher in 10 cm than in 10-20 cm under ridge surface without irrigation. The Bi-row concave ridge increased the soil moisture content and decreased the soil moisture potential in rows. In the whole period of tobacco growth, film mulching on the bi-row concave ridge reduced evapotranspiration from surface soil. These effects were further strengthened with irrigation treatment when drought occurred.